Koh Samui (Thailand) weather
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Forecast days
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Today. Maximum daytime temperature: 27 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder showers changing to heavy showers in the afternoon. Sunrise: ; Sunset: . UV: High;Today. Maximum daytime temperature: 27 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder showers changing to heavy showers in the afternoon. Sunrise: ; Sunset: . UV: High;
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Saturday 18 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 23 degrees Celsius. Thunder changing to light showers by late morning. Sunrise: ; Sunset: . UV: Very high;Saturday 18 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 23 degrees Celsius. Thunder changing to light showers by late morning. Sunrise: ; Sunset: . UV: Very high;
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Sunday 19 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 23 degrees Celsius. Thunder changing to light showers by late morning. Sunrise: ; Sunset: . UV: Very high;Sunday 19 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 23 degrees Celsius. Thunder changing to light showers by late morning. Sunrise: ; Sunset: . UV: Very high;
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Monday 20 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Very high;Monday 20 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Very high;
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Tuesday 21 May. Maximum daytime temperature: 30 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Very high;Tuesday 21 May. Maximum daytime temperature: 30 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Very high;
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Wednesday 22 May. Maximum daytime temperature: 30 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder. Sunrise: ; Sunset: . UV: Very high;Wednesday 22 May. Maximum daytime temperature: 30 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder. Sunrise: ; Sunset: . UV: Very high;
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Thursday 23 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder changing to heavy showers in the afternoon. Sunrise: ; Sunset: . UV: Very high;Thursday 23 May. Maximum daytime temperature: 29 degrees Celsius; Minimum nighttime temperature: 24 degrees Celsius. Thunder changing to heavy showers in the afternoon. Sunrise: ; Sunset: . UV: Very high;
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Friday 24 May. Beginning thunder. Sunrise: ; Sunset: .Friday 24 May. Beginning thunder. Sunrise: ; Sunset: .
Eight day forecast for Koh Samui
| Time | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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60% | 60% | 60% | 60% | 60% | 60% | 60% | 60% | 60% | 60% | 60% |
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27°
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27°
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26°
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26°
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26°
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25°
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25°
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24°
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24°
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24°
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24°
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29° | 29° | 29° | 29° | 28° | 28° | 27° | 27° | 27° | 27° | 27° |
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E
5
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E
5
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ENE
4
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E
4
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E
4
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ESE
4
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SSE
4
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SSE
4
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SSE
4
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SSE
4
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SSE
4
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12 | 12 | 11 | 10 | 9 | 8 | 6 | 7 | 7 | 7 | 7 |
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G | G | VG | VG | VG | G | G | G | G | G | G |
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Humidity
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80% | 80% | 80% | 81% | 83% | 86% | 89% | 90% | 90% | 91% | 92% |
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UV
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7 | 5 | 4 | 2 | 2 | 1 | - | - | - | - | - |
| Time | 00:00 | 01:00 | 02:00 | 03:00 | 04:00 | 05:00 | 06:00 | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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60% | 60% | 60% | 60% | 60% | 60% | 60% | 60% | 60% | 40% | 40% | 40% | 60% | 60% | 60% | 70% | 70% | 70% | 70% | 70% | 70% | 70% | 70% | 70% |
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24°
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24°
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24°
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24°
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24°
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24°
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24°
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24°
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25°
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26°
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27°
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28°
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28°
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29°
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28°
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28°
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27°
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26°
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25°
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25°
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25°
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24°
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24°
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24°
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26° | 26° | 26° | 26° | 26° | 26° | 26° | 26° | 28° | 29° | 30° | 30° | 31° | 32° | 31° | 30° | 30° | 29° | 28° | 27° | 27° | 26° | 26° | 26° |
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S
5
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S
5
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S
5
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S
5
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S
5
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SSW
5
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SSW
5
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SW
5
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SW
5
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SW
4
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SW
4
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WSW
4
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SSW
3
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SSW
3
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E
3
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NNE
3
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NW
3
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NE
4
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SW
5
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WNW
5
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SSE
6
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SW
7
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SW
7
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SW
7
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8 | 8 | 8 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 12 | 12 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 12 |
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VG | VG | G | G | G | G | G | G | G | VG | VG | VG | VG | VG | VG | VG | VG | VG | G | G | G | VG | VG | VG |
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Humidity
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92% | 93% | 93% | 93% | 94% | 94% | 93% | 93% | 88% | 82% | 77% | 75% | 72% | 70% | 72% | 74% | 77% | 80% | 84% | 88% | 89% | 90% | 91% | 92% |
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UV
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- | - | - | - | - | - | - | 2 | 3 | 5 | 7 | 8 | 8 | 8 | 6 | 5 | 3 | 2 | 1 | - | - | - | - | - |
| Time | 00:00 | 01:00 | 02:00 | 03:00 | 04:00 | 05:00 | 06:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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60% | 60% | 60% | 70% | 70% | 70% | 70% | 70% | 40% | 60% | 70% | 70% | 70% |
|
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24°
|
24°
|
24°
|
24°
|
24°
|
24°
|
24°
|
24°
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27°
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28°
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26°
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25°
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24°
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26° | 25° | 25° | 25° | 25° | 25° | 25° | 25° | 29° | 29° | 27° | 26° | 24° |
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SW
8
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SW
8
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SW
8
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SW
8
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SW
9
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WSW
9
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WSW
9
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WSW
10
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WSW
8
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W
9
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WSW
10
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WSW
11
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SW
13
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12 | 12 | 13 | 13 | 13 | 14 | 15 | 15 | 18 | 18 | 19 | 17 | 18 |
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VG | VG | VG | G | G | G | VG | VG | VG | G | G | VG | VG |
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Humidity
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92% | 93% | 94% | 94% | 95% | 94% | 93% | 93% | 73% | 71% | 77% | 86% | 91% |
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UV
|
- | - | - | - | - | - | - | 1 | 8 | 8 | 2 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
60% | 60% | 60% | 20% | 60% | 70% | 70% | 70% |
|
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24°
|
24°
|
24°
|
27°
|
29°
|
27°
|
25°
|
25°
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24° | 23° | 24° | 28° | 29° | 27° | 26° | 25° |
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WSW
13
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WSW
14
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WSW
14
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WSW
11
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WSW
10
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WSW
12
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WSW
10
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SW
11
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19 | 20 | 20 | 22 | 19 | 20 | 15 | 15 |
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VG | VG | VG | VG | VG | G | VG | VG |
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Humidity
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92% | 93% | 90% | 73% | 67% | 75% | 85% | 91% |
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UV
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- | - | 1 | 8 | 9 | 2 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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70% | 70% | 70% | 10% | 40% | 70% | 70% | 70% |
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24°
|
24°
|
24°
|
27°
|
29°
|
28°
|
26°
|
25°
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25° | 24° | 25° | 28° | 30° | 29° | 27° | 26° |
|
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SW
12
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SW
12
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SW
12
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SW
10
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SW
9
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SSW
9
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SSW
9
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SSW
9
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16 | 17 | 17 | 19 | 19 | 17 | 14 | 14 |
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G | G | VG | VG | VG | VG | VG | VG |
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Humidity
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92% | 93% | 90% | 72% | 64% | 70% | 84% | 91% |
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UV
|
- | - | 1 | 9 | 10 | 2 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
70% | 70% | 70% | 60% | 70% | 60% | 70% | 70% |
|
|
24°
|
24°
|
25°
|
27°
|
29°
|
28°
|
26°
|
25°
|
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26° | 25° | 26° | 29° | 31° | 29° | 28° | 27° |
|
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SSW
10
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SW
9
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SSW
9
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SSW
8
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S
7
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S
7
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S
7
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SSE
7
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14 | 13 | 13 | 17 | 17 | 15 | 12 | 12 |
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G | G | VG | VG | VG | VG | VG | VG |
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Humidity
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93% | 95% | 91% | 73% | 65% | 70% | 85% | 90% |
|
UV
|
- | - | 1 | 8 | 9 | 2 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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70% | 70% | 70% | 60% | 60% | 60% | 60% | 60% |
|
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25°
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24°
|
25°
|
27°
|
29°
|
27°
|
26°
|
25°
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26° | 26° | 26° | 29° | 30° | 29° | 28° | 27° |
|
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S
8
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S
8
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S
8
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S
7
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S
7
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S
7
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SSE
7
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SSE
8
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12 | 12 | 13 | 16 | 17 | 14 | 11 | 12 |
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G | G | VG | VG | VG | VG | VG | VG |
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Humidity
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94% | 95% | 92% | 73% | 66% | 73% | 85% | 91% |
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UV
|
- | - | 2 | 7 | 9 | 2 | - | - |
| Time | 01:00 | 04:00 |
|---|---|---|
| Weather symbols |
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Chance of precipitation
|
60% | 60% |
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25°
|
24°
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26° | 26° |
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S
8
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S
8
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12 | 12 |
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G | G |
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Humidity
|
93% | 95% |
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UV
|
- | - |
Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 9am shows you what you will see from 9am to 10am.
Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail or drizzle) will fall from the sky at a certain time.
This number shows the air temperature for the time period. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.
Feels like temperature considers other factors, such as wind speed and humidity. This gives you a better idea of how the temperature will actually feel at the time.
Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull.
Strong winds are shown in bold for speeds of 29 mph or more.
The arrow shows the direction the wind is blowing. The letters show the direction the wind is blowing from (on a standard 16-point compass).
The number represents the average wind speed expected at that time.
The arrow shows the direction of the wind (up is north). If the arrow points from land to sea, the wind will be blowing out to sea (‘offshore’). The number is the average wind speed.
Beware of offshore winds if you are using inflatables, paddle boards or kayaks. These winds can blow you out to sea. Read more about how wind will affect you at the beach.
Visibility measures the distance at which an object can be clearly seen.
| VP (Very Poor) | Less than 1 km |
| P (Poor) | 1.1 km to 4 km |
| M (Moderate) | 4.1 km to 10 km |
| G (Good) | 10.1 km to 20 km |
| VG (Very Good) | 20.1 km to 40 km |
| E (Excellent) | Greater than 40 km |
Humidity is the amount of water vapor in the air. If there is a lot of water vapour, the humidity will be high. The higher the percentage of humidity, the wetter it will feel outside.
UV exposure index and the protection required to help keep you safe:
No risk of UV - It’s safe to stay outside. Low - You can safely stay outside. Consider sunscreen in direct sunlight. Moderate - Take care during midday hours and do not spend too much time in the sun unprotected. Sunscreen advised. High - Seek shade during midday hours, cover up and wear sunscreen. Very high - Spend time in the shade between 11am and 3pm. Shirt, sunscreen and hat are essential. Extreme - Avoid being outside during midday hours. Shirt, sunscreen and hat essential.
This is the average height of the waves, 1-2 miles out to sea. The height of the waves can vary. The individual waves out to sea or at the beach can be higher than this number. If you are close to the water, keep an eye on the waves to stop you or your belongings being swept away.
Read more about calculating the expected height of the waves at the beach.
This is the average number of seconds between one wave and the next, 1-2 miles out to sea. A long wave period (more than 10 seconds) means the waves at the beach may be more powerful. Lifeguards can give you advice on waves if you’re planning to go into the water.
Read more about the period of waves.
The arrow shows the average direction of the waves 1-2 miles out to sea. It indicates how sheltered the beach will be from these waves. If the arrow points towards land, most of the waves’ power will reach the beach. If the arrow is parallel to or pointing away from land, the wave height is likely to be lower on the beach than it is offshore.
Lifeguards can give you advice on waves if you’re planning to go into the water.